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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 55 (1971)

Issue: 2. (February)

First Page: 333

Last Page: 333

Title: Oil and Gas Accumulations in Tin Fouye Tabankort Area (Algeria): ABSTRACT

Author(s): Claude Chanut, Charles Hubault, Philippe Riche

Article Type: Meeting abstract

Abstract:

During the past decade several large oil and gas fields have been discovered in the Tin Fouye Tabankort area, which is in the eastern Algerian Sahara Desert approximately 1,000 km southeast of Algiers. The oil and gas accumulations are related to a large Paleozoic north-south trending arch on the southern edge of the Ghadames basin. The hydrocarbons are found in 2 major stratigraphic zones: (1) an uppermost Ordovician sandstone which contains 2 major accumulations, (a) a gas accumulation in the highest part of the arch on the south (ca. 40 billion cu m reserves), and (b) a major oil accumulation extending northward from the gas to the plunging nose of the arch (ca. 150 million cu m reserves); (2) Upper Silurian to Lower Devonian zones in which 4 oil fields have been disco ered on northward-plunging noses; the 2 northernmost do not have structural closure on the south (ca. 145 million cu m reserves).

Three petroleum concessions have been granted in the Tin Fouye Tabankort area. SOPEFAL is the operator of the ASCOOP concession. The oil fields in the northern part of the arch have oil-water contacts tilted north to northwest with slopes ranging from 5 to 15 m/km. The Ordovician reservoir is enhanced both in size and petrophysical characteristics as a result of the development of a fluvioglacial facies related to the last Ordovician ice period.

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